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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5573fdc1a97d369b9d000f51bc3bf74e6c80cbbd9bf178b93cd3193c9a0b1ccc' 
  AND token = 'r3ARM/md0pfHGqsFuUgClZsgzW4uc2Rfr6A6sYqqmxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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