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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6727b8d9ad9c4a955cfff01adb3aae74fd39b9835768497af26d6b9301e66d14' 
  AND token = 'avTn4unBrgLWLX839rjp02O963tXknvQ0Jxta5yb8c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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