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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1b12fba8b005d8e62e224985878dce668afa43b6c9566b6ebfe043be538d424' 
  AND token = 'mGLwDsPkw79QCq245QUOBrM/4QyE78qdVw9MjaXGuA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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