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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0f57b199fbefae46c768caa3777c7419692f3348ba314b18a602ad4723ae2e7' 
  AND token = 'gA5o7EkAL2mPPXbD4ftygws4mOD2Bk3e0AabABqhYgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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