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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5aa4bc059ba879fbf26b4398cb9311c64c126e1a3efc623819400c94894e6565' 
  AND token = '2/ZKoNMSGVW07k8KcVuoYeYJS4WaiNpyC/YVBkezpUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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