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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3628f00e0a54a3ea73e22145c8ffa2dc59ae23995176389dd81eb7be6a2af836' 
  AND token = 'vpbPgBeeAdZWyKe6eGYa4NZqT5Tc/Xuue8mN4ILo00o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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