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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f323a2f8b34564dc0304d70f3e7942d771317da0ae11b3d727da2a1544de4843' 
  AND token = 'bxkg+YEQhZtLmHfH9UpNoqI+ta+XNc/6YHTCAgxzkkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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