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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfedd25839e838f8e3e887f22f16cc6277f1e3c3d01f8b43336837d3bf60a4aa' 
  AND token = 'SsSxd9gojF0tBuRc/2yk/GNDVH0Uotgth3AwaS81JQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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