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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9c1c5f68c82c6c3ded30475e6796a8ada030fba2515d0eca8cd415526c5505a' 
  AND token = 'O98eftuvdNwSPExk6mS4GYVCoon54dloe7HKeFuf35A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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