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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dbd2010b14ffd061bd061e65abefd9165118e121ed7d8667987c4a3487dab13' 
  AND token = 'QAB7J4li0mcjeF/o18B7td36apVKNyd9gph3bANaXQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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