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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf09c4209e358c66cf6f00047a007f3a5178079c39e5c3d1326b2146012fd3bb' 
  AND token = 'W821Xb50Mots9bX9zKf7tmbbAUNJDxjJl4NCMc+6Vpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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