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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4487f68112456b4eebb95b3ba5431b9ef585580fc8eacd589d9d69c9b90b6b4' 
  AND token = 'c74vLk9QBNTnmdcDXv44iowgH/hQSMaiQOjwuFntGQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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