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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94debba3ee1ac4c97c0a32912eee549ba37d1e05edf032e32e44f6b1d2cfb11f' 
  AND token = 'FaPgbqzjzi+W/3ylX652vRDQsnRDmQN98SyarFzzMqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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