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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2cf564584828b4bf6d9ec6b35d15144ad54706e8545ac6121b4c46fa8fabb32' 
  AND token = 'ZzaM+TQmse5b6tRZPmS/1IlAHLDgV1/bO5AqyBdNBEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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