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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af03368b155f7cba79a36c4234ae7c32d2fc0268ed7516dea2fea6ef473fea43' 
  AND token = 'TRrmwYFe8VVNAr3ESY6RCK5Drh9p37NJPjgnsgT8ito=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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