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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56869b3fc6de3b587eec9ddafeba9d0092180c63b8fe502cfce737f09e3a8635' 
  AND token = '/T2vc4BuSG93SlWruDIVGUg+v8Bvof6yuhBgeS+Ceh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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