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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17358dcfd9de6874cbb4857ec4560b95242d99500cb1ed536fda58aee36055b0' 
  AND token = 'GgaLKjwb77qdTX3T433BL9ROPCI6tCFdAdWNh8rAGQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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