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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9313783a9acb596e01c1592698f1301147dda97235439b879a055f4273e5cbd' 
  AND token = '7/zTZdddaELdJi8OF5Z/3mrNwsyvNIah5BRz2K+50aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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