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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1917ae5aee3bb362c27462c38c0eb51ac54ab819fc5637acafa62dcee87c958' 
  AND token = 'nBUkSy4OBXCKIamWgnENq4NPK3AF8Ijjj3D88yrjbZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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