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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf21325212852574cc4a341c6430b39c973030d71c0537091756392eb2f9482e' 
  AND token = '97D2UtaTCn5/vO66xG6m+IVfD3u1Ij0Sn1N6ggsF/DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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