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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbbb92c5a3c7727720e9067f26e0329613dc6357177c1ad7249c09985150aaed' 
  AND token = 'YnODbHvommml+tgDsk0/sgrk8kfdHdQCw6wiEQC7RbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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