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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f22eaab5c8ef69ef9cc7974a5a5090f526dda90dfc500a680a644251b1bd5a1' 
  AND token = 'wGRXMgb9qpencFjfdD6ZzYm4LSObnEEsT72d50thef4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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