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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0fb79e9a834ff89f3545d5c5d9da8b8a9d7d8d6643f2a3d764b08cbb57208df' 
  AND token = 'QyKlTCQjN74Tpd0ewEetj0x21aF+8BVG8dXfm1Einq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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