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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5b5abad1d9ed13b0a75f1a72fa0b35206f9d12581b622ae23098506d6a6eefe' 
  AND token = 'px4zDc8YsMbAgC/iJ6Gu1g7vstut12ze6QvNnyQjtPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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