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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a850b3ad3344c60b59a5bf6a25e99a3de21669be87331b9c47f53d5ce35a54b8' 
  AND token = '9DvEWnngsvopcYhDDuC5sZp8qQk+A/jjDpQXW9LQp3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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