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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '708660473aca050650eb29083b58e2d7a80c13b6ad2dc8684ca8b52c5a7e7fa5' 
  AND token = 'glbHccpVZOgPBuFg4uwunjfp2Np+mrtI6XKADgDu2vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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