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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dc23bc5e2bd9b53cce89a003bf12aef66728f961c70f086ea828b64a090bb9d' 
  AND token = '3Cr55kPt+yvZkXz2m2DBTqNVQ/xo7tZ3GT22av+JQL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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