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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd57fe979d323a35336a97ac8da3b02141bd4ad6273b991045dc545179eeb3aa2' 
  AND token = '7M8lamedfXeCbUtnq5ogsstFWF/JUvzWSzWLoc2AOOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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