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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '850d984f9a97795bc44d76a1b91127c8cb978d9f3fd9748594d2c2385cb77e99' 
  AND token = '5ozK5ZcQYmIQe2LuKuPZ2ecUBw0Oa1a3dtVNcYLdzEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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