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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57326fbe22311e9b7326ceac9e130739c810640fc91e29e9a07cc38c67371bd0' 
  AND token = 'Jj7dRuO2/Qdp6SZIRHPIJKMF1JCthhLFMaOQrICQbT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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