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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79bbcdc058ce96d57e81ef7e7fb0b2ca3917fb7f1c5393cdb8b1e521e592a02f' 
  AND token = 'ZidMuYoVzHlSWoR6FEq5h06MZsnfu69VeQYnohRf0O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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