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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9b406d0109198ab427cb26c5ee8700174fd1ec076b662bbdfd2810f7516d8a4' 
  AND token = 'yJpIMI1G8yn56QrR/iQDDQ6L7Ag3BlN/Om9EhKfpDuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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