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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0792fc199ee4b031b53fd46fea671ec8dfc832c0a108bcd4d81c0982febf059' 
  AND token = '7OzrCHzPWCgz78ni3CNCAIhzLdFEB4tyenNLU7wcLcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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