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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffe8acba61eaae6583061a3f45474377dfed0d5a837fe33bb5653e05e71b3664' 
  AND token = 'mbu3fiEipediYPiJtng6tcO1ZYjPkAmtLzUntpXotkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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