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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b8858c5c13cf5eb7176f8f745b81ef7c7126d4ac507c3b98dbe822a2c2700f4' 
  AND token = 'D5QVzOE1M+OnfOr+L7lcUWwlnukSfSxRqYk/NzHsIho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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