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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3761b2611d9cf9f681c328de8ab5876585764a8b82ae111260527b46244d6a3' 
  AND token = 'CG3+2A4KWAs2pz0ViIQT4DLqSueKuoTs1Aqba9u2lZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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