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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b814f72ae385faffdb8ed4309e72343e5b43c03863c31b33a9f133a5e76df5d6' 
  AND token = 'hMupimpwvjPcD0SxVO/eTcST9BDqaj8IxHIxiaUksRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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