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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1d9632d72fce669aacdf85bde8b02962791e7bfd585bfc11997753bc651af1c' 
  AND token = 'uYehMI9DMt7DOr2KVWdu8aIAYUT8ndE0N+5tlhzS7uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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