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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0373d9c803138738e0df5708b9d3073a8293e6e04ae2c0cb90270dd34ce40af1' 
  AND token = 'IUUJHPgiSdUX/Qx9d5k1KGJ9yOpTAcIjIQ21b3zHOp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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