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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b37284ce1927c53e91da72b775964cdba7479814fecd4061f939b9abba6925be' 
  AND token = 'vwppt0yFLpgRRgUsSsIWe5rvFHt+ty6D5TRr52/9SmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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