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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16782c70ebb41364c2079105c3f8458d1d508953b6ba62fd45ff81fb9a182702' 
  AND token = 'GlG4zDaMKR2Aek3KvAzSILm1APed2Z3Niw2jmb0Lqtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}