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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc3e9e9f28f44b839eded8c5750f3b059d3f4232a5f161c2cffbcc7438e85b5d' 
  AND token = 'CfpGM1dAsqQ7K5nP9hlg60wfR020DmWesWrVesjKp6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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