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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '103760328a83e67e7d8546be3250a8bcfc7d08e04c57a281a815409e3409f74c' 
  AND token = 'J8FvxENvnMaV25IvJCg8BfD6gaHjP+2dxzA/NAo3oo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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