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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26f717efab9dba319f1a5a3b83d2c87795384a7a99f12f026bd1336d2cb9f6d9' 
  AND token = 'qZYEkAHAaY4cTN8v1iMtp3QF8yPvHZ2ZWvrbNVdCXLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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