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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3a33ebd0ef1538eaf480beeb2892753a94e4027caf28b1421c7023749dca9bc' 
  AND token = 'WEpOk4SuFB+XAe6EDmja9YxkY6QulxhYYxRau6Pi+j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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