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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8a1b7683b90464fc9a22f01e8a0a9c049ec69d34a4dd8db2d257da06181604f' 
  AND token = 'xM114uJmHL5e4qK9Ny55wx/WiDh7WkDaqdAGLukRpuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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